Email Spoofing?

Can the "To:" field in email be spoofed by spammers? I've searched the web for spoofing information and everything I've found has reference to the "From:" field being spoofed but not the "To:" field. A user in my company keeps getting spam in his inbox and his "To:" field is that of another user in my company. Our server manager has been out.

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I have seen this before where the TO: field is populated with another name yet other accounts (users) will also get this email. Depending on the header information, the information is limited. Either they’re using some sort of mass mailer that actually hides all the BCC: or CC: recipients or they’re mailing to a list and then it’s being remailed.

One of the pains of spams. Almost makes you want to go to a trusted email system.

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All Internet mail "spoofs" the To, from and cc fields. When you're talking to the mail server you send the commands as to who the message will be sent to then you send the "DATA" then the headers for the message, which can be forged, the To, From which can be forged then the rest of the message.
If the user is using Exchange/Lotus Notes then they don't even have access to adjust these headers but because there's no validation done of the message headers (other than for spam analysis by many products) you can't rely on this information when it comes from an unknown source.

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